[CQ-Contest] RE: [RTTY] Data conversion Need an extrta port?

Dave Bernstein aa6yq at ambersoft.com
Wed Feb 4 16:18:17 EST 2004

The second paragraph of the section you mention says

"The project in this article is based on the FT8U245AM device
manufactured by FTDI Ltd in Scotland, (www.ftdichip.com).  This chip
comes as a 32 pin surface mount MQFP miniature package. To work, the
chip only requires a 6MHz crystal, some passives and the USB socket,
Fig3. The chip interfaces to an external microprocessor via an 8 bit
parallel port and four read write and control lines. From the micro's
point of view, the FT245 chip looks like a 384 byte FIFO buffer for
transmit, and a 128 byte FIFO buffer on receive. The FT245 works in the
full USB speed mode and can transfer data at around 1 Megabyte per

While the Windows driver supplied with the FT8U245AM does emulate a
serial port, you'd need an appropriately-programmed PIC or some other
embedded microprocessor with a built-in UART to create a PC-accessible
serial port. That's a little more involved than "you can use an USB port
as a serial port".


        Dave, AA6YQ

-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]
On Behalf Of K4SB
Sent: Wednesday, February 04, 2004 15:40
To: RTTY; writelog at contesting.com; cq-contest at contesting.com
Subject: Re: [RTTY] Data conversion Need an extrta port?

Guys, I was just messing around in Google, because the parallel port in
my hamshack machine seems to have given up the ghost. Windows says it's
OK, but it does not respond to a loopback test.

But, in my travels I came across these 4 web sites. The first one is
especially interesting in that it shows how you can use an USB port as a
serial port. Scroll down until you come to a section marked "Baking and
then take a look at the interface required. The others have very
interesting data on the parallel port, including the complete readout of
all 25 pins and what they do.

http://www.lvr.com/parport.htm   this one shows how to connect 2 PCs.

Just might be something in there for you guys running low on serial
ports, or wanting to use the parallel port in XP, ect.

And I'm sure one of our guys will grab that schematic and rip out most
of it to just make a keying line.

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